The World Born Dead
No access to the Ethereal Plane
The following spells directly use the Ethereal Plane and do not function in this campaign setting, because that plane cannot be accessed: chamber, ethereal jaunt, etherealness, ether blast, and Leomund’s secret chest. In addition, magic items which duplicate these spells, such as oil of etherealness, do not function in the absence of the Ethereal Plane.
The following spells have elements that do not function because there is no Ethereal Plane to effect: dimensional anchor, invisiblity purge, make manifest, mass manifest, see invisibility, true seeing, vanish, zone of respite, and zone of revelation. Other elements of these spells function normally, but they cannot affect the Ethereal Plane because that plane is not accessible.
Creatures such as the blink dog, ethereal marauder, ethereal flicher, and phase spider are unknown in this campaign setting. Further, ghosts are extremely rare.